There is only one rule. It's much easier to add new things than to change existing things

what if you wanted a scarf, but god said

Traceback (most recent call last):
  File "you.py", line 1, in <module>
    scarf()
NameError: name 'scarf' is not defined

No problem, just mention it in the requirements - early on. Not when everything is built to work this one specific way.

And don't even get them started on doors.

mf said choas

Well, does the giant demon also have to be able to equip the scarf?

Sure. Player character? No.